////
//// Created by lfm on 2025/2/23.
////
//#include <iostream>
//using namespace std;
//
//int main()
//{
//    int a = 10;
//    //1.引用必须初始化
//    //int &b;//
//    int &b = a;
//    //2.引用在初始化后，不可以改变
//    int c = 20;
//    b = c;
//
//    cout << "a = " << a << endl;
//    cout << "b = " << b << endl;
//    cout << "c = " << c << endl;
//    return 0;
//}